CN201877548U - Odd harmonic suppressed type spiral cavity filter - Google Patents
Odd harmonic suppressed type spiral cavity filter Download PDFInfo
- Publication number
- CN201877548U CN201877548U CN2010206442347U CN201020644234U CN201877548U CN 201877548 U CN201877548 U CN 201877548U CN 2010206442347 U CN2010206442347 U CN 2010206442347U CN 201020644234 U CN201020644234 U CN 201020644234U CN 201877548 U CN201877548 U CN 201877548U
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- cavity
- circuit
- odd harmonic
- lower cover
- type spiral
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Abstract
The utility model provides the technical scheme of an odd harmonic suppressed type spiral cavity filter. The odd harmonic suppressed type spiral cavity filter comprises a cavity fixedly assembled by a lower cover of the cavity and an upper cover, the outer end of a resonant cavity at the output side of the lower cover of the cavity is fixedly provided with a suppression circuit setting cavity, a suppression circuit is an LC lowpass filtering circuit, the input end of the LC lowpass filtering circuit is connected with a coupling lead of the resonant cavity at the output side, and the output end of the LC lowpass filtering circuit is electrically connected with an interface socket. In the technical scheme, the odd harmonic passband suppression ratio is high, the odd harmonic suppressed type spiral cavity filter has the characteristics of simple structure, easiness in processing and manufacturing, and convenience in debugging, the technical parameter of the spiral cavity filter can be effectively improved, and the applied range is wider.
Description
Technical field
The utility model relates to the spiral cavity filter, in particular have the spiral cavity filter of good harmonic suppression effect.
Background technology
The spiral cavity filter is the seal chamber by cavity lower cover and the fixing assembling of loam cake, be provided with the spiral resonance oscillator that is supported by the oscillator skeleton in some resonant cavities of cavity lower cover, loam cake is corresponding to each spiral resonance oscillator of cavity lower cover and adjustable frequency modulation bolt and the accent coupling bolt of being provided with of coupling dividing plate spiral.The advantage of spiral cavity filter is that the insertion loss is little, selectivity is high, be easy to processing and manufacturing etc., is widely used in each technical field such as cable TV, communication, realizes frequency selection or signal testing function.The length of the spiral resonance oscillator of spiral cavity filter is 1/4 λ, can obtain the signal curve of needs at 1/4 λ resonance, but at 3/4 λ, 5/4 λ ... (1/4+n/4) λ place, just can produce harmonic bandpass at odd octave place, it is the odd harmonic passband, this intrinsic odd harmonic passband can produce sizable interference to useful signal, for example, frequency of heart during Headend 1 channel uses is 52.5MHz, present spiral cavity filter can be in 3 octaves of this centre frequency, the odd harmonic of the above generation of 149.25MHz just passband, be transferred to user side through cable network, 5 channels that meeting is augmented user side, centre frequency is that the signal of 147MHz produces interference, influences the user and normally uses.For another example, suppress without harmonic wave, because of the existence of its 3 subharmonic passband influences detecting of useful signal if use the spiral cavity filter of signal deteching circuit.Once adopted at present the technology solution that changes resonance frequency by the length that changes the resonance oscillator, because resonance frequency is can the change amount minimum, harmonic wave oscillator length change amount is also very little, be difficult to the inhibition precision that reaches required in actual the adjustment, and rejection ratio has only several dB, can not satisfy the above rejection ratio requirement of 30dB.
Summary of the invention
The band that goal of the invention of the present utility model is to improve the spiral cavity filter outward degree of inhibition, promptly improve and provide a kind of odd harmonic inhibition type spiral cavity filter inhibition ability with outer interference signal.The technical scheme of the odd harmonic inhibition type spiral cavity filter that the utility model provides, its major technique content is: a kind of odd harmonic inhibition type spiral cavity filter, it comprises the cavity by cavity lower cover and the fixing assembling of loam cake, be provided with the spiral resonance oscillator that supports by the oscillator skeleton in each resonant cavity of cavity lower cover, on cover that spiral is adjustable to be provided with the frequency modulation bolt and to transfer the coupling bolt, the outlet side resonant cavity outer end of cavity lower cover is set with the inhibition circuit chamber is set, described inhibition circuit is the LC low-pass filter circuit, the input of LC low-pass filter circuit links to each other LC low-pass filter circuit output electrical connection interface socket with the coupling lead-in wire of outlet side resonant cavity.
In above-mentioned overall technical architecture, cavity lower cover integral body is shaped on the inhibition circuit chamber resonant cavity is set, its loam cake both can be to be fastened on resonant cavity and to suppress the overall structure that circuit is provided with the chamber with sealing, also can comprise being fixed in the resonant cavity part and being fixed in suppressing the two split loam cakes formation that circuit is provided with the chamber.
In above-mentioned overall technical architecture, the inhibition circuit is provided with the chamber and is fixedly connected on the outlet side resonant cavity of cavity lower cover as individual components.
The odd harmonic inhibition type spiral cavity wave filter technology scheme that the utility model provides, referring to common spiral cavity filter shown in Figure 7 output curve diagram to Headend 1 channel signals, with shown in Figure 8 be the output curve diagram of this odd harmonic inhibition type spiral cavity filter to Headend 1 channel signals, compare as can be known, rejection ratio to the triple-frequency harmonics passband has reached more than the 60dB, also obviously same for the inhibition effect of other each odd harmonic passband equally, the technical program is simple in structure, and be easy to processing, make and debugging, the technical parameter of spiral cavity filter is effectively improved, and its range of application is then more extensive.
Description of drawings
Fig. 1 lays down the plan structure figure of loam cake for this odd harmonic inhibition type spiral cavity filter
Fig. 2 is the A-A sectional structure chart of Fig. 1
Fig. 3 is that fixedly make-up is connected in each resonant cavity of cavity lower cover loam cake plan structure figure partly
Fig. 4 fixes to suppress the loam cake plan structure figure that circuit is provided with the chamber to being buckled in
Fig. 5 is embodiment circuit theory diagrams of LC low pass filter
Fig. 6 and Fig. 7 are respectively the waveform snapshots that common spiral cavity filter and this odd harmonic inhibition type spiral cavity filter are used to handle cable TV 1 channel output signal equally.
Embodiment
Describe technology contents of the present utility model in detail below in conjunction with concrete enforcement structure.
The odd harmonic inhibition type spiral cavity filter that the utility model provides, its structure constitutes cavity lower cover 1 and the loam cake 2 that includes the metal aluminum, both are fixed as seal chamber up and down, cavity lower cover 1 was separated with 2-12 resonant cavity in 3 minutes by some coupling dividing plates, and the inhibition circuit that is provided with in outlet side resonant cavity outer end with cavity lower cover 1 one is provided with chamber 4, the inhibition circuit is provided with chamber 4 and also can fixedly be assembled on the outlet side resonant cavity outer wall for individual cavity, each resonant cavity can be circular cylindrical cavity or square cavity, the spiral resonance oscillator 6 that central authorities are provided with oscillator skeleton 5 and are supported by oscillator skeleton 5 in each resonant cavity, loam cake 2 is corresponding to each resonance oscillator and the adjustable screw 7 that is provided with the frequency modulation bolt and transfers the coupling bolt of coupling dividing plate spiral, the inhibition circuit is provided with the lid in chamber 4 and can makes with loam cake 2 integral body, or as this enforcement structure, the lid 8 that the inhibition circuit is provided with chamber 4 is separate caps.The inhibition circuit is provided with and is provided with LC low-pass filter circuit circuit board 9 in the chamber 4, the silver-plated copper coupling lead-in wire 11 of the input of LC low-pass filter circuit and outlet side resonant cavity is connected, LC low-pass filter circuit output be fixed on cavity under the interface socket 10 of cover outer wall be electrically connected.
Claims (4)
1. odd harmonic inhibition type spiral cavity filter, it comprises the cavity by cavity lower cover and the fixing assembling of loam cake, be provided with the spiral resonance oscillator that supports by the oscillator skeleton in each resonant cavity of cavity lower cover, on cover that spiral is adjustable to be provided with the frequency modulation bolt and to transfer the coupling bolt, the outlet side resonant cavity outer end that it is characterized in that the cavity lower cover is set with and suppresses circuit the chamber is set, described inhibition circuit is the LC low-pass filter circuit, the input of LC low-pass filter circuit links to each other LC low-pass filter circuit output electrical connection interface socket with the coupling lead-in wire of outlet side resonant cavity.
2. odd harmonic inhibition type spiral cavity filter according to claim 1 is characterized in that cavity lower cover integral body is shaped on each resonant cavity and the inhibition circuit is provided with the chamber.
3. odd harmonic inhibition type spiral cavity filter according to claim 1 is characterized in that suppressing circuit and cavity is set is fixedly connected on the outlet side resonant cavity of cavity lower cover as individual components.
4. odd harmonic inhibition type spiral cavity filter according to claim 1 is characterized in that loam cake is to suppress the two split loam cakes that circuit is provided with cavity and constitute by being fixed in resonant cavity part and being fixed in.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206442347U CN201877548U (en) | 2010-12-01 | 2010-12-01 | Odd harmonic suppressed type spiral cavity filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206442347U CN201877548U (en) | 2010-12-01 | 2010-12-01 | Odd harmonic suppressed type spiral cavity filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201877548U true CN201877548U (en) | 2011-06-22 |
Family
ID=44165458
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206442347U Expired - Fee Related CN201877548U (en) | 2010-12-01 | 2010-12-01 | Odd harmonic suppressed type spiral cavity filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201877548U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9859601B2 (en) | 2014-09-09 | 2018-01-02 | Hon Hai Precision Industry Co., Ltd. | Harmonics suppression filter |
-
2010
- 2010-12-01 CN CN2010206442347U patent/CN201877548U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9859601B2 (en) | 2014-09-09 | 2018-01-02 | Hon Hai Precision Industry Co., Ltd. | Harmonics suppression filter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110622 Termination date: 20151201 |
|
| EXPY | Termination of patent right or utility model |